Cheapest return ORD–SOF flights, May

AirHint found the following cheapest return flights from Chicago (ORD) to Sofia (SOF) in May 2026 (see full year).

Return flights

12 May - 10 Jun jetBlue
11 May - 10 Jun jetBlue
06 May - 25 May Alaska Airlines
25 May - 09 Jun Icelandair
07 May - 25 May Spirit Airlines
19 May - 02 Jun Icelandair
16 May - 26 May Frontier Airlines
14 May - 21 May Spirit Airlines
28 May - 12 Jun WestJet
19 May - 17 Jun jetBlue
18 May - 17 Jun jetBlue
25 May - 19 Jun Icelandair
09 May - 23 May LOT
21 May - 15 Jun WestJet
19 May - 19 Jun Alaska Airlines
20 May - 29 May Spirit Airlines

Also check the deals for one-way flights from Chicago to Sofia in May.

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